INVESTIGATION OF TUNGSTEN-TANTALUM-COLUMBIUM-BASE ALLOYS
Abstract
Two categories of properties pertaining to selected refractory alloy systems are presented. First, the alloys were screened as to their usefulness as high-temperature structural materials. Measurements of hot-hardness and oxidation resistance of arc-cast specimens delineated areas within the tungsten-tantalum-columbium ternary system combining high hardness at temperatures up to 2900 F. with improved oxidation resistance at 2190 F. The addition of tungsten and titanium improved the oxidation resistance of tantalum at 1830 and 2190 F., probably because of the formation of complex oxides in the outer scale. The second area concerned mechanical properties of tungsten or columbium at low and intermediate temperatures. The low-temperature yield properties of tungsten were studied, employing a compression test. Static strain-aging of tungsten at 400 to 600 C. was attributed to hydrogen. Dynamic strain-ading of columbium-oxygen alloys occurred at 300 to 400 C., while the addition of titanium, zirconium, and vanadium to columbium was found to shift the strain-aging region to 700 to 800 C. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1961
- Accession Number
- AD0267386
Entities
People
- A. Leslie Mincher
- Charles R. Mckinsey